测试优化前性能

select stv_tbl_perm.name as table, count(*) as mb
from stv_blocklist, stv_tbl_perm
where stv_blocklist.tbl = stv_tbl_perm.id
and stv_blocklist.slice = stv_tbl_perm.slice
and stv_tbl_perm.name in ('lineorder','part','customer','dwdate','supplier')
group by stv_tbl_perm.name
order by 1 asc;

set enable_result_cache_for_session to off;

-- Query 1
-- Restrictions on only one dimension. 
select sum(lo_extendedprice*lo_discount) as revenue
from lineorder, dwdate
where lo_orderdate = d_datekey
and d_year = 1997 
and lo_discount between 1 and 3 
and lo_quantity < 24;

-- Query 2
-- Restrictions on two dimensions 

select sum(lo_revenue), d_year, p_brand1
from lineorder, dwdate, part, supplier
where lo_orderdate = d_datekey
and lo_partkey = p_partkey
and lo_suppkey = s_suppkey
and p_category = 'MFGR#12'
and s_region = 'AMERICA'
group by d_year, p_brand1
order by d_year, p_brand1;

-- Query 3
-- Drill down in time to just one month 

select c_city, s_city, d_year, sum(lo_revenue) as revenue 
from customer, lineorder, supplier, dwdate
where lo_custkey = c_custkey
and lo_suppkey = s_suppkey
and lo_orderdate = d_datekey
and (c_city='UNITED KI1' or
c_city='UNITED KI5')
and (s_city='UNITED KI1' or
s_city='UNITED KI5')
and d_yearmonth = 'Dec1997'
group by c_city, s_city, d_year
order by d_year asc, revenue desc;